两种杨树的双菌根定植受树龄和寄主身份的影响。

IF 3.8 2区 生物学 Q2 MYCOLOGY
Jake Nash, Brian Looney, Melissa A Cregger, Christopher Schadt, Rytas Vilgalys
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引用次数: 0

摘要

植物已经进化出与菌根真菌和内生真菌的共生关系,这对植物的生长和生存至关重要。虽然大多数植物与单一菌根真菌相关,但有一类被称为“双菌根植物”的植物与丛枝菌根真菌和外生菌根真菌相关。虽然在其他双菌根寄主上,随着植物发育从丛枝菌根的优势向外生菌根的定植转变已经被证实,但尚不清楚在杨树物种中,菌根的定植如何随着植物年龄的变化而变化。我们对两种杨树(tremuloides和trichocarpa)进行了对照生长实验,以测试真菌定殖率的年龄依赖性变化和寄主特异性定殖模式。我们发现只有毛霉霉具有双菌根定植,而银耳霉霉与外生菌根真菌有关联,而不与丛枝菌根真菌有关联。随着植株年龄的增长,菌根真菌的定植量增加,而根内生真菌的定植量减少。我们所记录的许多早期定植的内生真菌具有很强的腐殖能力,这可能是快速定植的重要特征。暗隔内生菌比菌根真菌的任何一类都要丰富,可能是杨树根系真菌群落的重要功能成员。我们的发现代表了双菌根定植发展的一种新模式,并说明杨树物种与丛枝菌根真菌的关联不同。我们的研究结果也强调了暗隔内生菌定殖动态在双菌根植物上的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dual-mycorrhizal colonization is determined by plant age and host identity in two species of Populus.

Plants have evolved symbioses with mycorrhizal and endophytic fungi that are essential for their growth and survival. While most plants associate with a single guild of mycorrhizal fungi, a select group termed "dual-mycorrhizal plants" associate with both arbuscular mycorrhizal and ectomycorrhizal fungi. Although a shift from predominance of arbuscular mycorrhizal to ectomycorrhizal colonization with plant development has been demonstrated on other dual-mycorrhizal hosts, it is not known how mycorrhizal colonization shifts with plant age in Populus species. We performed a controlled growth experiment with natural field-sourced inocula to test for age-dependent shifts in fungal colonization rates and for host-specific patterns of colonization in two species of Populus (P. tremuloides and P. trichocarpa). We found that only P. trichocarpa displayed dual-mycorrhizal colonization, while P. tremuloides associated with ectomycorrhizal fungi, but not arbuscular mycorrhizal fungi. Both guilds of mycorrhizal fungi increased in abundance with plant age, while root endophytic fungal colonization decreased. Many of the early-colonizing endophytic fungi that we documented have strong saprotrophic capabilities, which may be an important trait for fast colonization. Dark septate endophytes were more abundant than either guild of mycorrhizal fungi, and are likely to be functionally important members of the Populus root fungal community. Our findings represent a novel pattern in the development of dual-mycorrhizal colonization and illustrate that Populus species vary in their association with arbuscular mycorrhizal fungi. Our results also highlight the importance of dark septate endophyte colonization dynamics on dual-mycorrhizal plants.

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来源期刊
Mycorrhiza
Mycorrhiza 生物-真菌学
CiteScore
8.20
自引率
2.60%
发文量
40
审稿时长
6-12 weeks
期刊介绍: Mycorrhiza is an international journal devoted to research into mycorrhizas - the widest symbioses in nature, involving plants and a range of soil fungi world-wide. The scope of Mycorrhiza covers all aspects of research into mycorrhizas, including molecular biology of the plants and fungi, fungal systematics, development and structure of mycorrhizas, and effects on plant physiology, productivity, reproduction and disease resistance. The scope also includes interactions between mycorrhizal fungi and other soil organisms and effects of mycorrhizas on plant biodiversity and ecosystem structure. Mycorrhiza contains original papers, short notes and review articles, along with commentaries and news items. It forms a platform for new concepts and discussions, and is a basis for a truly international forum of mycorrhizologists from all over the world.
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